Visual display device and a method for operating a visual...

Details Visual display device and a method for operating a visual... Visual display device and a method for operating a visual...

2006-07-25

2006-07-25

Frech, Karl D. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

Reexamination Certificate

active

07080784

ABSTRACT:
A visual display device (1) comprises a visual display panel (5) which comprises an electro-optical medium (17) provided by a cholesteric liquid crystal medium which defines a plurality of pixels (20) which are alternately and selectively operable in a first light transmitting mode for forming a background (40) and a second light scattering mode for forming a character (39) against the background (40). A video projector (35) projects a light beam (37) at a rear major face (34) of the visual display panel (5) which defines an image (38) of a character (39) being displayed on the visual display panel (5). The light in the light beam (37) is incident on the pixels (20) which are operating in the second light scattering mode for forming the character (39) thereby increasing the brightness of the pixels (20) operating in the light scattering mode when viewed by a subject (33), and thus enhancing the contrast between the pixels (20) operating in the second light scattering mode which form the character (39), and the remaining pixels (20) which form a background (40) of the visual display panel (5).

REFERENCES:
patent: 5592193 (1997-01-01), Chen
patent: 6175353 (2001-01-01), Hoeksma
patent: 6556515 (2003-04-01), Sekiguchi
patent: 11 184442 (1999-07-01), None
patent: 2002 091385 (2002-03-01), None

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